Two currents- carrying wires may attract each other. In
absence of other forces, the wires will move towards each
other increasing the kinetic energy . Does it contradict
the fact that the magnetic force cannot do any work and
hence cannot increase the kinetic energy?

Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetc energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?

If two straight current carrying wires are kept perpendicular to each other almost touching then the wires

Magnetic lines of force may intersect each other.

An artificial satellite in the presence of frictional forces will move into an orbit closer to the earth and may have increased kinetic energy. Explain this.

A: Like currents repel and unlike currents attract each other (in conductor). R: Magnetic force acts in the direction of current.

A : If net force acting-on a system is zero, then work done on the system may be nonzero. R : Internal forces acting on a system can increase its kinetic energy.

Two coils of wires A and B are mutually at right angles to each other as shown in the figure. If the current in one coil is changed, then in the other coil

Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature ?

Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature ?